Compared to smaller motors, dynamic balancing of large-scale motor rotors is a critical process. Whether it's a cast aluminum rotor, copper bar rotor, or wound rotor, process control for balancing is extremely important. Ms. [Name] will now have a brief discussion with you regarding the dynamic balancing of large-scale motor rotors.
Analysis of dynamic balancing elements for large-size rotors
To ensure rotor accuracy, dynamic balancing is a necessary step, but the steps before the rotor dynamic balancing process are even more important, such as the balance of the motor shaft itself, the balance of the rotor core, and the fit between the core and the shaft.
The shafts of large-size motors are mostly made of web plates. The precision of web plate processing, the indexing of each other during welding, and the conformity of the welds must all be well controlled. In order to ensure the smooth progress of subsequent processing, many motor manufacturers balance the shaft before inserting the iron core.
During the core manufacturing process, the flatness of the laminations and the control of burrs must be in place to prevent the formation of horseshoe-shaped laminations, thereby further reducing the initial imbalance of the rotor.
Defects in the aluminum casting process, imbalances caused by the winding and wiring of the wound rotor, and asymmetry caused by the welding process of the copper bar rotor are all factors that directly affect the balancing effect; therefore, the control of rotor dynamic balance should start from the initial imbalance of the rotor.
Significance of rotor dynamic balancing
Rotor imbalance is one of the main causes of excessive rotor vibration and noise, directly affecting the motor's performance and lifespan. Therefore, research on rotor dynamic balancing technology, especially for flexible rotors, is of great significance for improving motor quality.
Commonly used machinery contains a large number of rotating parts, such as various drive shafts, main shafts, electric motors and turbine rotors, which are collectively referred to as rotating bodies.
Ideally, the pressure exerted on the bearings by a rotating body is the same whether it is rotating or not; such a rotating body is a balanced rotating body. However, in engineering, various rotating bodies, due to factors such as uneven material composition, defects in the blank, errors in processing and assembly, and even asymmetrical geometry in the design, cause the centrifugal inertial forces generated by each tiny particle on the rotating body to not cancel each other out during rotation. These centrifugal inertial forces act on the machine and its foundation through the bearings, causing vibration, generating noise, accelerating bearing wear, shortening the machine's lifespan, and in severe cases, causing destructive accidents. Therefore, it is necessary to balance the rotor to achieve the allowable level of balance accuracy, or reduce the amplitude of the resulting mechanical vibration to within the allowable range.
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